Repent ye therefore,.... The Ethiopic version adds, "and be baptized", See Gill on "Ac 2:38",and be converted. The apostle's sense is, repent of the sin of crucifying Christ, which is what he had been charging them with, and turn unto him, and acknowledge him as the Messiah; receive his doctrines, and submit to his ordinances; externally reform in life and conversation, and bring forth fruits meet for repentance, such as will show it to be true and genuine:that your sins may be blotted out; or forgiven, see Ps 51:9.
Not that repentance and reformation procure the pardon of sin, or are the causes of it, for forgiveness is entirely owing to the free grace of God, and blood of Christ; but inasmuch as that is only manifested and applied to repenting and converted sinners; and who are encouraged to repent, and turn to the Lord from the promise of pardon; it is incumbent on them, and is their interest so to do, that they may have a discovery of the remission of their sins by the blood of Christ.
Though no other repentance and conversion may be here meant than an external one; and the blotting out of sin, and forgiveness of it, may intend no other than the removing a present calamity, or the averting a threatened judgment, or the deliverance of persons from national ruin, Ex 32:32.
These Jews had crucified the Lord of glory, and for this sin were threatened with miserable destruction; the apostle therefore exhorteth them to repentance for it, and to a conversion to the Messiah, that so when ruin should come upon their nation, they might be delivered from the general calamity; when it would be terrible times to the unbelieving and impenitent Jews, but times of refreshment, ease, peace, and rest from persecution, to the believers, as is next expressed.
When the times of refreshing shall come from the presence of the Lord; or "that the times of refreshing may come", as the Syriac version; either seasons of spiritual refreshment, joy, and peace, through the great and precious promises of the Gospel, and by the application of the blood and righteousness of Christ, to such penitent and converted sinners; which refreshment and comfort come from the Lord, and are accompanied with his gracious presence: or else seasons of rest, and deliverance from the violent heat of persecution; which was the case of the saints at the destruction of Jerusalem; they were not only saved from that ruin, but delivered from the wrath of their most implacable enemies.
The Ethiopic version renders it, "and the day of mercy shall come from the presence of the Lord", repenting sinners find mercy; and a discovery of pardon is a time of mercy; and when God grants this, he affords his presence.
The Jews call the world to come a time of refreshment; and say ,"better is one hour xwr trwq lv, "of refreshment", in the world to come, than the whole life of this world.'' Pirke Abot, c. 4. sect.